<template>
    <div class="todo-footer">
        <label>
        <input type="checkbox" @click="finishAllTodoObj"/>
        </label>
        <span>
        <span>已完成{{ finishedTodoNum }}</span> / 全部{{ todos.length }}
        </span>
        <button class="btn btn-danger" @click="selfClearFinishedObj">清除已完成任务</button>
    </div>
</template>

<script>
export default {
    name:"Footer",
    props:["todos","finishAllTodoObj","clearFinishedObj"],
    data(){
        return {
            finishedTodoNum:""
        }

    },

    methods:{
        selfFinishAllTodoObj(){
            this.finishAllTodoObj();
        },
        selfClearFinishedObj(){
            this.clearFinishedObj()
        }

    },

    watch:{
        todos:{
            immediate:true,
            deep:true,
            handler(newVal){
                let tempNum = newVal.filter(e => e.finished ==true);
                 this.finishedTodoNum = tempNum.length
            }
        }
    }
}
</script>

<style scoped>
    .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
    }

    .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
    }

    .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
    }

    .todo-footer button {
    float: right;
    margin-top: 5px;
    }
</style>